B is the correct answer. "Your sister" would be enough to have a complete meaning in the sentence, but "Louisa" was added to modify it as an appositive.
Answer:
a dark night or a dark knight
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Well, studying would be the rising action, being handed the test would be the climax, the conflict would be her not wanting to get a bad grade, and her getting a good grade would be the resolution. The answer is RESOLUTION. That is a really boring plot to a story though. XD
